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Label Element Value
In accordance with IFRS 9 [member]  
Increase (Decrease) Through Adoption Of New Accounting Principle btg_IncreaseDecreaseThroughAdoptionOfNewAccountingPrinciple $ 0
Retained earnings [member] | In accordance with IFRS 9 [member]  
Increase (Decrease) Through Adoption Of New Accounting Principle btg_IncreaseDecreaseThroughAdoptionOfNewAccountingPrinciple 45,478,000
Accumulated other comprehensive income [member] | In accordance with IFRS 9 [member]  
Increase (Decrease) Through Adoption Of New Accounting Principle btg_IncreaseDecreaseThroughAdoptionOfNewAccountingPrinciple $ (45,478,000)